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Saturday, May 1. 2010Comments
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Please report! Also, many users use a relay host, because their own infrastructure is on a dynamic IP, or they don't want to cope with the details of running a public mailserver that basically has to be up 24/7. Removing the 'first incoming IP' is really nothing to be worried about. An obvious reminder: This will only make you anonymous among the set of users of this mail server. In my case, as the only user of the server, it stops location tracking. It does not make me anonymous. Most email providers don't want to remove IPs because they don't want to deal with abuse complaints. It would be easy to match message IDs or some inserted random header in case, but it's just too much work for most ISPs. The rason is that some spam filters mark as spam any mail that has a dynamically-assigned IP address in ANY Received: header. This is obviously wrong if the user of said dynamic IP is authenticated (but arguably sensible if the dynamic IP user is not, as in spambots on infected user PCs). So, removing the user name and IP for authenticated users is good. I currently use something a bit more elaborate that leaves the Received: line in but edits out the IP and user name. I found the recipe on the Postfix-Users mailing list. You won't be blacklisted. Many companies use this to hide internal IPs. There is no reason (other than nefarious purposes) for the world+dog to know the internal IP space of an intra-net. If you blacklisted are then then something is incorrectly configured. |
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